Last



Patented Mar. 22, 1927.

Para

WALTER A. KRnN'rLnn, or nnfrnorr, MICHIGAN, Assi'snon To KRENTLEn-Annonn HINGE LAST COMPANY, on inn-Tenir, mienten-N, A conronA'rIoN on MICHIGAN.

LAsT.

Application filed August 22',- 1923: ASerial No. 558,806.

My present invention is an improved hinge last construction and the objectis t0 Simplity and perfectl hinge lasts.

In my development of varjions methods ot lasts and hinge constructions, therefore, l have devised numerous simple and improved forms ot hinge constiuctiom` such as that of my Patent No. 1,459,061, issued June 19, 1923 .and my present invention .iS -dreted primarily to improve the type oit last shown in said patent., althongh the present invention, broadly considered, may be applied advantageously to other types of hinge or link construction.

In the manufacture .of hinge lasts itis customary and desirable to have the tore part and heel part-,position arranged and equipped to swing on a pivot or pivotal axis permitting relative movement between the fore part and heel part `for straightening and collapsing the last. When a linl; connection is employed, as in my said prior patent, it is customary and desirable to position the link holding rivets or pins in tore part and heel part dis.-

r aligned trom the pivot .or anis on which the two parte swing tor relative movement. Vhen the last is in lengthened or .extended position these rivet points are below the pivot or axis and when the last is in shortened or collapsed position these rivet points are above or at the opposite side ot the pivot or axis. ln ordei1 to have the connecting linl; members or hinge devices hold the last parts firmly and tightly vin either collapsed or extended position, it is necessary to permit a slight yield or spring asy the last swings fromv one position to another, because the axis on which the connecting link or hinge members swing is dili'erent from the pivot or axis on which the last members swing. in prior constructions where no provision was made lfor the Oditl'iculty above briefly outlined, the contacting wood faces ct' the last parts would lwear quickly to permit. this swinging action and therefore when the last was in either entendedV orl collapsed position the linh land hinge devices were loosened. because of thestrain and wear involved in snapping or springing the last partspast the center axis. 'in my present intention l have provided ,automatic vmeans which will admitot-a slight'lengthening of the hinge or flink membersrelativly the hinge or pinsv uniting the same to' fore part and heel part as the'last swings by the otal center .or axis on which the last parts swing. This slight lengthening or yield is furthermore automatically actuated to hold the last parts in as close and tight end contact in either collapsed or lengthened position when the last is being swung by the pivotal anis, and thus prevents undue wear upon the contacting wood faces ont' the last parts, compensating, therefore, as well as preventing the looseness between the last parts during use.

Thus mypresent invention enables the hinge members and the last members to swing .on'disaligned pivots or aXeswith automatic means to compensate for the varying tension involved and furthermore to automatically replace the hinge or link retaining action after each movement,

I accomplish this desirable -teature by providing the linl; and one connecting rivet or pim-with a bevelled face permitting thev pin and link to move slightly along said bevelled face, thus allowing effective lengthen ing .of the link and pin. In embodying the present invention in a link and spring typeV of last shown in my said Patent No. 1,459,061, I orm one end ci' the link or hinge member with an inclined or bevelled face along which the adjacent pivot can ride or move when the last parts are snapped or sprung by the center or axis oi. movement of the two parts of the last.

Referring to the drawings illustrating a preferred embodiment of the inventionw Fig. 1 is a side view of a last partly Ain cross section and in lengthened position.

Fig, 2'is a similar view illustrating the last partly flexed,

Fig. 3 is a fragmentary view illustrating the last in completely collapsed position.

Fig. 4 is a cross-sectional view through the pivotal center oit' the lastparts.

'1 Ilg. 5 is a view of a modified form oi? As shown in the drawings Fig. 1 indicates the orepart and Fig. 2 the heel part of a last which may be et `any size, type, style and with dividing lines ot'y out, it desired. is here-ill -i'llnstr-'ated a well-known type of knuckle Ai'eint last is shown, having a concave faceS termed on the torepart and the correspond-ing convener 'knuckle portion d on the heel -part. 1n the tore part' 1 is also termed a recess 5 and in the heel part a sir-mila-rrecess 6 or sumeent width and depth t@ receive the connecting hinge 10 and one or more springs 12. The link 10 is firmly held to the fore part 1 by a pin 15 and is adjustably secured in the heel part at the pin 16 and around these pins the springs 12 12 are clamped, thus exerting a constant tightening tension on the last parts. The lines of cut on the last here sho-Wn provide top faces 17 and 18, permitting a substantial opening olf the last and botto-m shoulders 19 and 20, constituting abutments or contacting portions When the last is closed.

In the form of last as herein illustrated, I prefer to position a central or pivotal pin 21 on which the tore part 1 and heel part 2 swing for their relative movement. Such a pin, however, is not necessary to the Jfeatures of my present invention since any construction permitting a relative pivotal movement of the heel part and fore part, eitlie-r on a positive pivotal pin such as 21,-or on an `imaginary line or axis-so long as this axis is disaligned With the axis on which the link or hinge member 10 swings-either 15 or16 in the present form- Will carry out my inven-tion.

Where a pivotal member 21 is employed and a single link 10, I form a slot 22 in the link of substantially greater Width than the diameter ot' the pin 21, as well as oi suihcient length for the flexing of the last parts Without the pin 21 striking the link 10. Assuming that the link 10 Will swing on the fore part and hence on the rivet 15 I provide at the heel part portion of the link-that adapted to engage the rivet 16--a bevelled face 25 Which will permit relative movement of the rivet 16 and this end portion of the link 10 to alloW for a lengthening of the heel and fore part connections on the link While the last is being moved from collapsed to lengthened position around the pivot on axis 21 and yet at all times keeping the last parts in rigid union. This position is illustrated in Fig. 2. lVhen the last is in collapsed position no excessive strain is put thereon and the springs 12 hold the tivo parts in collapsed position because the rivets 15 and 16 are beyond or above the center. lVhen the last is in collapsed position the faces 19 and 20 are in firm engagement and the strain incident to shoe making, levelling machine operations, etc., will tend to hold the link l0 With the rivet 16 at the base of the loevelled face 25. I may form this bevelled face 25 either as an open recess, as illustrated, orras a slot in the link 10 as indicated iii the dotted lines in Fig. 2 and by the numeral 30 in Fig. 5. In either event the Jfeature of having the link 10 swing on the axis with provision for lengthening movement and the last parts 1 and 2 swing on a disaligiied axis and yet keeping both last parts and link in firm and rigid union While permitting the free flexing of the last without undue Wear and substantially under the same tension, is carried out.

' My invention is further described and deiined in the form ot claims, as follows:

1. A two-part last having said parts constructed and arranged for relative movenient about a pre-determined axis, means connecting said parts movable on a different axis and means formed on said last named means acting automatically to permit the movement of said last parts and connecting means on the different axes at substantially uniform tension.

2. A last having` a heel part and a Jfore part arranged for relative movement about a pre-determined axis, a connecting link uniting said parts at points remote from said axis and means formed integral with the connecting link and connecting one end of said link with one of the last. parts to permit of an effective lengthening and shorteiiing of said link during collapsing and straightening of the last.

3. A'last having a heel part and a fore part arranged for relative movement about a .pre-determined axis, a connecting link uniting said parts at points remote from said axis and means formed integral with the connecting link and connecting one end of said link with one of the last parts to perinit of an effective lengthening and shortening -of the last in combination with spring tension means uniting the last parts.

4. A hinge last having a fore part and heel part arranged for relative pivotal movement, a connecting link united to said parts by fixed rigid rivets, one of said link and rivet portions being constantly in operative engagement While permitting an effective lengthening and shortening of the effective link joining action during flexing of the last parts.

5. A two-part last arranged for relative movement, retaining pins, a pivot pin on which said last parts move, a rigid link operatively connected to said retaining pins uniting said last parts and having one end torined with an inclined face permitting the link' to move relatively on the adjacent retaining pin to allow an effective lengthening of the saine during flexing of last.

G. A two-part last arranged for relative movement, retaining pins, a pivot pin on which said last parts move, a rigid link operatively connected to said retaining pins uniting said last parts and having one end `formed With an inclined face permitting the link to move relatively on the adjacent retaining pin to allow an eective lengthening of the saine during flexing of last in combination with spring tension means holding the last parts in yielding position.

In testimony whereof, I have signed my naine to this speciication.

YVALTER A. KRENTLER. 

